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## Homework Statement

F and G are not 0.

F and G are parallel

Proof that F X G is=0

Attempt for a sol:

F=(a1,b1,c1)

G=(a2,b2,c2)

FXG=.....

But then I don´t know how to show that they are parallel.

Or..

Find some numbers for F and G that I know that makes them parallel and show that FXG

are=0

But I think I´m not supposed to use numbers, but a,b,c...

Would you use either one of theses attempts or not?